Publications by authors named "V I Stepanov"

Pycnodysostosis (PD) is a rare autosomal recessive skeletal dysplasia from impaired bone resorption due to osteoclastic dysfunction. The features of PD are deformity of the skull, maxilla, and phalanges; osteosclerosis; and bone fragility. We describe the case of a patient with complaints of multiple fractures of the lower extremities in the anamnesis and pain in the lower extremities, cervical spine, and shoulder girdle during physical exertion.

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In this study, the optimal engraving parameters were determined through the analysis of scanning electron microscopy (SEM) data, as follows: a laser power density of 5.5 × 10 W/cm, an irradiation rate of 0.1 mm/s, a well radius of 60 μm, a distance between well centers of 200 μm, and a number of passes for each well of 20.

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  • The Nivkhs are an isolated ethnic group native to the Russian Far East, with distinct genetic characteristics influenced by their ancient ancestry and geographical isolation.
  • Genetic studies reveal that the Nivkh gene pool significantly differs from neighboring populations, specifically showing low genetic overlap with groups such as the Udege, Koryaks, Evenks, and Chukchi.
  • Analysis of their Y chromosome haplogroups indicates that the Nivkhs share some common ancestry with other northern Mongoloid groups, while also possessing unique genetic components that link them to certain regions in China and Myanmar.
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  • - On October 9, 2022, LHAASO detected a significant afterglow from the gamma-ray burst 221009A, achieving record photon statistics in the TeV energy range.
  • - This observation allowed researchers to test the idea of Lorentz invariance violation (LIV), which is related to faster-than-light travel predictions in some quantum gravity theories.
  • - The study established that the energy scales for LIV effects are significantly higher than previously thought, with new lower limits being 10 times the Planck energy for linear effects and 6×10^{-8} times the Planck energy for quadratic effects, improving earlier constraints by 5-7 times.
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In this Letter we try to search for signals generated by ultraheavy dark matter at the Large High Altitude Air Shower Observatory (LHAASO) data. We look for possible γ rays by dark matter annihilation or decay from 16 dwarf spheroidal galaxies in the field of view of the LHAASO. Dwarf spheroidal galaxies are among the most promising targets for indirect detection of dark matter that have low fluxes of astrophysical γ-ray background while having large amount of dark matter.

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